1、Designation: B 617 98 (Reapproved 2004)Standard Specification forCoin Silver Electrical Contact Alloy1This standard is issued under the fixed designation B 617; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revis
2、ion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This specification covers 90 % silver-10 % cop
3、per alloytubing, rod, wire, strip, and sheet material for electricalcontacts.1.2 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to become familiarwith all hazards including those identified in
4、 the appropriateMaterial Safety Data Sheet for this product/material as pro-vided by the manufacturer, to establish appropriate safety andhealth practices, and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B 277 Test Method for Hardness
5、of Electrical ContactMaterialsB 476 Specification for General Requirements for WroughtPrecious Metal Electrical Contact Materials3. Manufacture3.1 Raw materials shall be of such quality and purity thatthe finished product will have the properties and characteristicsprescribed in this specification.3
6、.2 The material shall be finished by such operations (coldworking, heat treating, annealing, turning, grinding, or pick-ling) as are required to produce the prescribed properties.4. Chemical Composition4.1 Material produced under this specification shall meet therequirements for chemical composition
7、 prescribed in Table 1.5. Mechanical Requirements5.1 Mechanical properties shall conform to the listings ofTable 2 or Table 3.5.2 All test specimens shall be full thickness or diameterwhen practical.5.3 All tests are to be conducted at room temperature, about68F (20C).6. General Requirements6.1 The
8、provisions of Specification B 476 shall apply to allmaterials produced to this specification.7. Inspection and Testing7.1 Material furnished under this specification shall beinspected by the manufacturer as detailed in the applicableprovisions of Specification B 476 and as listed as follows:7.1.1 Vi
9、sual inspection at 103.7.1.2 Temper test (hardness or tension, but not both). Atension test is recommended for strip below 0.030-in. (0.8-mm)thickness and for wire of any diameter.7.1.3 Dimensional tests.7.1.4 Spectrographic or chemical analysis when indicatedby the purchaser order.8. Keywords8.1 ar
10、cing contacts; coin silver alloy; compositions; electri-cal contacts; impurities; precious metals; silver alloy; silvercopper alloy1This specification is under the jurisdiction of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility of SubcommitteeB2.05 on Precious Meta
11、ls and Electrical Contact Materials.Current edition approved May 1, 2004. Published May 2004. Originallyapproved in 1977. Last previous edition approved in 1998 as B 617 98.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For A
12、nnual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.TABLE 1 Chemical CompositionAElement Weight %Silver 89.6 to 91.0Copper 9.0 to 10.4Zinc 0.06 maxIron 0.05 maxCadmium 0.05 maxLead 0.03 maxNickel 0.01 maxAluminum 0.005 maxPhosphorus 0.02 ma
13、xTotal others 0.06 maxAAnalysis is regularly made for the elements for which specific limits are listed.If, however, the presence of “other” elements is suspected or indicated in thecourse of routine analysis, further analysis shall be made to determine that thetotal of these “other” elements and th
14、e listed impurities are not in excess of the totalimpurities limit.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall apply only when specified by the purchaser in
15、 theinquiry, contract, or order, for agencies of the U.S. Government.S1. Referenced DocumentsS1.1 The following documents of the issue in effect on dateof material purchase form a part of this specification to theextent referenced herein:S1.1.1 U.S. Federal Standards:3Fed. Std. No. 102 Preservation,
16、 Packaging and PackingLevelsFed. Std. No. 123 Marking for Shipment (Civil Agencies)S1.1.2 U.S. Military Standards:3MIL-STD-129 Marking for Shipment and StorageS2. Quality AssuranceS2.1 Responsibility for InspectionUnless otherwise speci-fied in the contract or purchase order, the manufacturer isresp
17、onsible for the performance of all inspection and testrequirements specified. Except as otherwise specified in thecontract or purchase order, the manufacturer may use his ownor any other suitable facilities for the performance of theinspection and test requirements, unless disapproved by thepurchase
18、r at the time the order is placed. The purchaser shallhave the right to perform any of the inspections and tests setforth when such inspections and tests are deemed necessary toassure that the material conforms to prescribed requirements.S3. Preparation for DeliveryS3.1 Preservation, Packaging, and
19、Packing:S3.1.1 Civil AgenciesThe requirements of Fed. Std. No.102 shall be referenced for definitions of the various levels ofpackaging protection.S3.2 Marking:S3.2.1 Military AgenciesIn addition to any special mark-ing required by the contract or purchase order, marking forshipment shall be in acco
20、rdance with MIL-STD-129.S3.2.2 Civil AgenciesIn addition to any special markingrequired by the contract or purchase order, marking forshipment shall be in accordance with Fed. Std. No. 123.3Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098TABLE 2 Mechanical Properties of Sheet and StripTemperReduction inB or through the ASTM website(www.astm.org).B 617 98 (2004)3
